Class: Puppet::Settings::ChainedValues

Inherits:

Object

• Object
• Puppet::Settings::ChainedValues

Defined in:

lib/puppet/settings.rb

Overview

Lookup configuration setting value through a chain of different value sources.

Constant Summary

ENVIRONMENT_SETTING =

"environment".freeze

ENVIRONMENT_INTERPOLATION_ALLOWED =

['config_version'].freeze

Instance Method Summary

• #initialize(mode, environment, value_sets, defaults) ⇒ ChainedValues constructor private

  A new instance of ChainedValues.

• #interpolate(name) ⇒ Object

  Lookup the interpolated value.

• #lookup(name) ⇒ Object

  Lookup the uninterpolated value.

Constructor Details

#initialize(mode, environment, value_sets, defaults) ⇒ ChainedValues

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of ChainedValues.

See Also:

• Puppet::Settings.values

# File 'lib/puppet/settings.rb', line 1239

def initialize(mode, environment, value_sets, defaults)
  @mode = mode
  @environment = environment
  @value_sets = value_sets
  @defaults = defaults
end

Instance Method Details

#interpolate(name) ⇒ Object

Lookup the interpolated value. All instances of ‘$name` in the value will be replaced by performing a lookup of `name` and substituting the text for `$name` in the original value. This interpolation is only performed if the looked up value is a String.

Parameters:

• name (Symbol) —

  The configuration setting name to look up

Returns:

• (Object) —

  The configuration setting value or nil if the setting is not known

# File 'lib/puppet/settings.rb', line 1273

def interpolate(name)
  setting = @defaults[name]

  if setting
    val = lookup(name)
    # if we interpolate code, all hell breaks loose.
    if name == :code
      val
    else
      # Convert it if necessary
      begin
        val = convert(val, name)
      rescue InterpolationError => err
        # This happens because we don't have access to the param name when the
        # exception is originally raised, but we want it in the message
        raise InterpolationError, "Error converting value for param '#{name}': #{err}", err.backtrace
      end

      setting.munge(val)
    end
  else
    nil
  end
end

#lookup(name) ⇒ Object

Lookup the uninterpolated value.

Parameters:

• name (Symbol) —

  The configuration setting name to look up

Returns:

• (Object) —

  The configuration setting value or nil if the setting is not known

# File 'lib/puppet/settings.rb', line 1251

def lookup(name)
  set = @value_sets.find do |value_set|
    value_set.include?(name)
  end
  if set
    value = set.lookup(name)
    if !value.nil?
      return value
    end
  end

  @defaults[name].default
end